Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/326409
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dc.contributor.authorGALLO, P. Hpt_BR
dc.contributor.authorMICHELETTI, P. L.pt_BR
dc.contributor.authorBOLDRINI, K. R.pt_BR
dc.contributor.authorRISSO-PASCOLOTTO, C.pt_BR
dc.contributor.authorPAGLIARINI, M. S.pt_BR
dc.contributor.authorVALLE, C. B. dopt_BR
dc.date.accessioned2011-07-22T01:04:31Z-
dc.date.available2011-07-22T01:04:31Z-
dc.date.created2008-02-01pt_BR
dc.date.issued2007pt_BR
dc.identifier.citationEuphytica, Wageningen, Holanda, v. 154, n. 2, p. 255-260, 2007.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/326409pt_BR
dc.descriptionMicrosporogenesis of several Brachiaria species of the Brazilian collection at Embrapa Beef Cattle has been analyzed in detail. This paper reports abnormal cytokinesis in three accessions of three different species (Brachiaria humidicola, 2n = 4x = 36, Brachiaria decumbens, 2n = 4x = 36, and Brachiaria dura, 2n = 6x = 54). Chromosomes paired in bi-, tri-, and quadrivalents in these accessions, whereas chromosome segregation at meiosis I was characterized by exclusion of laggards as micronuclei. In a high number of meiocytes, the first sign of cytokinesis appeared only in metaphase II and did not divide the meiocyte into a dyad. Total absence of cytokinesis was also detected among meiocytes in the second division. Since in both cases the two metaphase plates were very close, they favored the rejoining of chromosome sets after anaphase II and formed a restitutional nucleus in telophase II. Second cytokinesis occurred after telophase II in most meiocytes. Monads, dyads, and triads with n or 2n nuclei were observed among meiotic products. The 2n gametes observed correspond to the first division restitution (FDR). The number of affected cells in each accession was variable, but the number of microspores with restitutional nucleus, including those scored in tetrads and the released ones, did not exceed 9%. Although polyploidy is common in the genus Brachiaria, its origin is still unclear. Current results suggest that 2n gametes may have contributed to the evolutionary history of the genus.pt_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectBraquiáriapt_BR
dc.subjectBrachiaria durapt_BR
dc.subjectCampo Grandept_BR
dc.subjectMato Grosso do Sulpt_BR
dc.subjectBrasilpt_BR
dc.subjectFeed cropspt_BR
dc.subjectFeed grassespt_BR
dc.title2n Gamete formation in the genus Brachiaria (Poaceae: Paniceae).pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2011-07-22T01:04:31Zpt_BR
dc.subject.thesagroBrachiaria Humidicolapt_BR
dc.subject.thesagroBrachiaria Decumbenspt_BR
dc.subject.thesagroCitogenética Vegetalpt_BR
dc.subject.thesagroGramínea Forrageirapt_BR
dc.subject.thesagroMelhoramento Genético Vegetalpt_BR
dc.subject.thesagroPoliploidiapt_BR
dc.subject.thesagroPlanta Forrageirapt_BR
dc.subject.nalthesauruscytogeneticspt_BR
dc.subject.nalthesaurusBrazilpt_BR
dc.subject.nalthesaurusplant breedingpt_BR
dc.subject.nalthesauruspolyploidypt_BR
dc.description.notesCNPGC.pt_BR
riaa.ainfo.id326409pt_BR
riaa.ainfo.lastupdate2011-07-21pt_BR
dc.contributor.institutionPatrícia Helena Gallo, UEM; Pamela Lonardoni Micheletti, UEM; Kellen Regina Boldrini, UEM; Claudicéia Risso-Pascotto, UEM; Maria Suely Pagliarini, UEM; Cacilda Borges do Valle, CNPGC.pt_BR
Aparece nas coleções:Artigo em periódico indexado (CNPGC)

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